94 lines
3.1 KiB
Plaintext
94 lines
3.1 KiB
Plaintext
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* Cypress cyttsp touchscreen controller
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Required properties:
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- compatible : must be "cypress,cyttsp-i2c" or "cypress,cyttsp-spi"
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- reg : Device I2C address or SPI chip select number
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- spi-max-frequency : Maximum SPI clocking speed of the device (for cyttsp-spi)
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- interrupts : (gpio) interrupt to which the chip is connected
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(see interrupt binding[0]).
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- bootloader-key : the 8-byte bootloader key that is required to switch
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the chip from bootloader mode (default mode) to
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application mode.
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This property has to be specified as an array of 8
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'/bits/ 8' values.
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Optional properties:
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- reset-gpios : the reset gpio the chip is connected to
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(see GPIO binding[1] for more details).
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- touchscreen-size-x : horizontal resolution of touchscreen (in pixels)
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- touchscreen-size-y : vertical resolution of touchscreen (in pixels)
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- touchscreen-fuzz-x : horizontal noise value of the absolute input device
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(in pixels)
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- touchscreen-fuzz-y : vertical noise value of the absolute input device
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(in pixels)
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- active-distance : the distance in pixels beyond which a touch must move
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before movement is detected and reported by the device.
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Valid values: 0-15.
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- active-interval-ms : the minimum period in ms between consecutive
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scanning/processing cycles when the chip is in active mode.
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Valid values: 0-255.
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- lowpower-interval-ms : the minimum period in ms between consecutive
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scanning/processing cycles when the chip is in low-power mode.
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Valid values: 0-2550
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- touch-timeout-ms : minimum time in ms spent in the active power state while no
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touches are detected before entering low-power mode.
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Valid values: 0-2550
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- use-handshake : enable register-based handshake (boolean). This should
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only be used if the chip is configured to use 'blocking
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communication with timeout' (in this case the device
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generates an interrupt at the end of every
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scanning/processing cycle).
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[0]: Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
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[1]: Documentation/devicetree/bindings/gpio/gpio.txt
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Example:
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&i2c1 {
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/* ... */
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cyttsp@a {
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compatible = "cypress,cyttsp-i2c";
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reg = <0xa>;
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interrupt-parent = <&gpio0>;
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interrupts = <28 0>;
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reset-gpios = <&gpio3 4 GPIO_ACTIVE_LOW>;
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touchscreen-size-x = <800>;
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touchscreen-size-y = <480>;
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touchscreen-fuzz-x = <4>;
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touchscreen-fuzz-y = <7>;
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bootloader-key = /bits/ 8 <0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08>;
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active-distance = <8>;
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active-interval-ms = <0>;
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lowpower-interval-ms = <200>;
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touch-timeout-ms = <100>;
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};
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/* ... */
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};
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&mcspi1 {
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/* ... */
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cyttsp@0 {
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compatible = "cypress,cyttsp-spi";
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spi-max-frequency = <6000000>;
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reg = <0>;
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interrupt-parent = <&gpio0>;
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interrupts = <28 0>;
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reset-gpios = <&gpio3 4 GPIO_ACTIVE_LOW>;
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touchscreen-size-x = <800>;
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touchscreen-size-y = <480>;
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touchscreen-fuzz-x = <4>;
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touchscreen-fuzz-y = <7>;
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bootloader-key = /bits/ 8 <0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08>;
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active-distance = <8>;
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active-interval-ms = <0>;
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lowpower-interval-ms = <200>;
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touch-timeout-ms = <100>;
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};
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/* ... */
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};
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